"This is crazy!" exclaims Lou Dobbs, in a CNN special report on "hackable" Diebold machines and what are described as "voting machine sleepovers."

In the report, "Democracy At Risk," reporter Kitty Pilgrim talks with a Princeton professor who shows how Diebold machines can easily be manipulated with a virus to change a voter's selections.

"The Diebold machines we tested do not have a paper trail," Pilgrim tells Dobbs. "The record tape on the inside of the machine can be altered by the virus, and there is no other record of how someone voted. Once they walk away, that vote can be lost or stolen..."